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klio [65]
3 years ago
12

An experiment was carried out at 25 °C by dissolving an unknown mass of magnesium ribbon into excess 1 mol dm–3 hydrochloric aci

d. The volume of gas produced over a period of 6 minutes was measured using a gas syringe. The result was plotted as shown in Figure 1
Time (min)

Figure 1 Volume of gas produced against time

a)Write a balanced equation for its reaction with hydrochloric acid.






(2 marks)
Use the data from Figure 1
to determine the total volume of gas produced (1mark)







to calculate the moles of gas produced at STP (2 marks)
[1 mole of any gas at STP has a volume of 22 400 cm3.]






to calculate the mass of limestone magnesium used.














(2 marks)

(i) What is meant by the term ‘rate of reaction’?


(1 mark )

Besides temperature, identify TWO other factors that can affect the rate of the reaction.




marks)
Chemistry
1 answer:
user100 [1]3 years ago
8 0

Answer:

to calculate the mass of limestone magnesium used.

Explanation:

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harkovskaia [24]

Answer:

this is answers to the second picture

Explanation:

1-   energy

2- structure

3- reaction

4- substance

5- reactants

6- products

7- changed

8- At first there is no reaction because of the protective oxide coating on the aluminum. But soon an exothermic reaction between bromine and aluminum causes brown fumes of bromine to be given off. But as a new substance, aluminum bromide is produced. White smoke is produced.

9-   heated to 120 degrees Celsius it melts and first forms a pale-yellow liquid.

In this form the atoms are covalently bonded, and the liquid can flow easily. However, heated up beyond 150 degrees Celsius, the result is a dark red

10- When a chemical change occurs it is more difficult to revert the substance back to its original state. (To be honest I don't know)

3 0
3 years ago
Using two different instruments I measured the length of my foot to be 27 centimeters and 27.00 centimeters. Explain the differe
Sophie [7]

Answer:

As you used two diferent instruments, one is more sensitive than the other.

Explanation:

The sensitivity of an instrument is the minimum amount of magnitude that can be  differentiate a measurement system.

In method A, you got 27 cm, so if in method B, you got 27.00, method B is more sensitive. It's like saying that one system measures more than the other

8 0
3 years ago
In an energy diagram for a chemical reaction, the reactants are always plotted to the left of the products.
Dominik [7]

the answer is false at lest that is what i know

8 0
3 years ago
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sugar taken in a boiling tube is strongly heated. a) write the procedure of this experiment . b) which are the products obtained
Tpy6a [65]

Answer:

chemical changes

Explanation:

A chemical change is one in which a new kind of matter is formed. It is always accompanied by energy changes. The process is not easily reversible and hence, it is a permanent procedure.

Burning of charcoal produces a new kind of produces in the combustion process.

Both heating of copper(ii)carbonate strongly and zinc oxide will lead to a decomposition reaction in which new compounds are formed.

6 0
2 years ago
What is white light?
muminat
White light is what the eye sees when wavelengths of all colours reach the eye.

It is a combination of Red, Blue and Green wavelengths of light, that is perceived as white.
6 0
3 years ago
Read 2 more answers
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